Campbell mubbay hunter



Patented Aug. 15

C. IVI. HUNTER. ATMOSPHERICBURNER. APPLICATION FILED Nov. 6. I9I5.

55 an aperture being provldedin the casing for ra oren.

CAMPBELL MURRAY HUNTER, LONDON, ENGLAND.

ATMOSPHERIC BURNER.

l Speccation of Letters Patent. Patented Aug, 15, 1916.

Application filed November 6, 1915. Serial No. 59,959.

. siding at London,- in thecounty of Middlesex, England, have invented certain new and useful Improvements in Atmospheric Burners; and I do hereby declare the following to be a full, clear, and exact description "of the invention, such as will enable others skllled in the art to which it appertains to make and use the same.

My invention relates to atmospheric burners for gas and other fuel^of like physical nature of relatively large capacity, for heating for industrial purposes, such, for instance, as the heating of boiler and other furnaces, and 'wherein the fuel is used at a high velocity or pressure, as for example in the burner forming the subject of former Letters Patent No. 1,071,053, granted to me August 26th, 1913.

The object of my present invention is to provide improved means for introducing and controlling the air supply both as regards volume and temperature, and also to suppress or minimize the noise heretofore inherent in such a burner.

My invention, broadly stated, embraces the combination with a centrally disposed fuel-duct, of a series of surrounding 'air' passages, or ducts for supplying the air necessary to maintain combustion of the fuel, and means for successively closing said air ducts or passages 'at their 4delivery ends said means being of a character to create a continuous fuel duct of substantially smooth bore and uniform cross sectional area, whereby spaces or pocketsl productive of eddies in the current are avoided.

To this end my invention furthermore embraces the provision in a gas burner of the following novel features: air ports formed `by a series of cone frusta placed symmetrically and in iiXed relation one within the other and having a centrally arranged, preferably round, passage through their apices through which the jet of gas passes; an axially movable sleeve valve for controlling the air ports and which at the same time forms an extensible fuel duct and maintains a smooth bore for passage of the gas; a

'casing forming a chamber inclosing the inlets of the air cones, and also preferably the fuel-ductmnd sleeve valve extension thereof,

entrance of the air, such aperture being adapted for connection to a pipe'or conduit soy that the air may be fed through a silencing box, heater, or from any desired source;

,said several elements being variously combined as will appear in the claims hereto appended.

In the drawings chosen for the purpose of illustrating this invention, the scope whereof ls pointed out in the claims: Figure 1 is a plan view of an atmospheric burner embody ing my invention, a portion of the casing being broken away, Fig. 2 is a longitudinal central section of the same, and Fig. 3 is a transverse section taken in the plane of the line 3 3, Fig. 2, looking in the direction of the arrow.

Like symbols refer to like parts wherever they occur.

With the aid of the drawings I will now proceed to describe my invention more fully, so that others skilled in the art to which it appertainsmay apply the same.

In the drawings, l indicates the gas chamber of a burner with which the gas supply pipeconnects at Gr, said gas chamber preferably having a contracted throat, as at la, where it delivers'into the gas or fuel duct 4 of the burner and through which the gas or other fuel issues at a high velocity.

A steam jet pipe 2 with which a steam supply pipe connects as at S, may be utilized where necessary to secure the delivery of the gas or other vfuel at a high velocity, and when present said steam -jet is centered with thethroat la leading to the fuel delivery duct 4, and the jet is controlled by the usual or any approved form of needle valve 3.

The gas or fuelduct 4 of the burner is provided with a helical vane 5 when it is desired to impart a whirling motion to the fuel passing therethrough.

A sleeve 6, the function of` which will hereinafter appea, is telescopically mounted on the fuel duct 4, and when advanced constitutes a continuation of the fuel duct, accordingly the portion 4 of the fuel duct should be of such length that when the sleeve is pushed forward thereon the two will form a continuous tube or fuel duct of substantially equalcross sectional area. The

outer end of the portion 4 of the fuel duct` 7 7 indicates cone frusta arranged in fixed relation, spaced at suitable distances apart to form the ports 8 and held in corre :t relative position by the webs 9, these Webs be.

lng advantageously arranged in more or less spiral form7 as indicated in the drawing,

and may be carried by the mouth piece l of the burner as shown, or in any convenient manner. This arrangement of cones constitutes in effect a number of air inductors of high efficiency in series enabling the gas to draw a high proportion of air through the ports by virtue of its kinetic energy.

The function of sliding sleeve 6 which when extended is in effect a continuation of fuel ductf7 is that of a valve to regulate the How of air through the ports 8. The axial movement of this sleeve or supplemental fuel duct 6 by aid of handle 6a successively opens or closes air ports 8 as may be required.V The closing of the air ports at the inner ends in this manner insures that a smooth bore is always presented for the passage of the gas with no dead side pockets, such pockets being productive of noise and Iinimical to efficiency. This movable sleeve is also, in effect, a movable prolongation of the portion 4: of the fuel duct.

The mouthpiece 10 of the burner may be of any desired length; it is flared at the outer end, and is proportioned so that a powerful draft is paused through the air ports. It may be integral with or attached to any of the other parts.

l1 is a casing or chamber which incloses the air passages and ports, and preferably also the fuel duct and air regulating sleeve, andlis constructed for attachment to or is formed integral with the burner mouthpiece, air ports and gas nozzle. It is provided with an opening 12 adapted for attachment of a pipe or conduit.

Although ,in the foregoing description I have described thev burner as being used with gas it is to be understood that it is also applicable for use with carbureted air, 01l vapor, coal dust or other fuel or combustlble matter in like physical condition.

Having thus described my invention, what claim and desire to secure by Letters Patent is:

l. In an atmospheric burner, the combination with an internally disposed fuel duct,

of a series of surrounding air duets of constant cross-sectlon fior supplying` the air to support combustion, and means for successively closing the air ducts at their delivery ends said means being adapted to constitute a continuation of the fuel duct.

2. In an atmospheric burner, the combination of a fuel duct, and a plurality of spaced cone (frusta arranged in lixed relation to each other and in axial aliuement.

with the fuel duct, the fuel duct and cone frusta being proportionate in size and relatively movable to close the several air ducts.

In an atmospheric burner, the combination of a fuel duct, a plurality of spaced cone-frusta arranged in fixed relation with each other, and a mouth-piece, said elements being arranged in axial alinement, the cone frusta and fuel duct being relatively movable, and a casingor hood which surrounds the fuel duct and cone-frusta.

4. In an atmospheric burner, the combination with a fuel duct, of a plurality vof spaced cone frusta7 and a plurality of webs interposed between the cone frusta and which maintain the frusta in fixed relation, said webs being tangentially disposed with relation to the openings in the apices of the frusta, the fuel duct and the cone frusta being in axial alinement and being relatively movable.

5. In an atmospheric burner, the combination of a fuel duct having an extension' `telescopically mounted thereon, and a plurality of fixed and spaced cone frusta, the fuel duct extension being relatively movable both to the fuel duct and frusta.

6. In an atmospheric burner, the combie nation with a centrally disposed fuel duct,

y'of a series of'surrounding air ducts for supstant area having their delivery ends in alinement and concentric with the fuel duct,

said series of air ducts and the fuel-duct being proportionate insize and relatively movable whereby thel V'air ducts are succes-L sively closed' at their delivery ends.

In testimony whereof I affix my. signature.

CAMPBELL 'MURRAY HUNTER. 

